Hydraulic toggle press



y 1934- J. w. BRUNDAGE ,960,727

HYDRAULIC TOGGLE PRESS Filed July 14, 1932- (l tourney Patented May 29,1934 UNITED STATES HYDRAULIC TO GGLE- PRESS James William Brundage,Akron, Ohio, assignor. to The Summit Mold & Machine Company, Akron,Ohio, a corporation of Ohio Application July 14, 1932, Serial No.622,402

6 Claims. (01. 18-17) This invention relate to molding or vulcanizingpresses, particularly those of, the general type disclosed in my PatentNo. 1,895,603 of January 31, 1933, having press members mounted forrelative rectilinear movements in parallelism and for relative tiltingmovements into and out of line.

One object of my invention is to provide a combined floating-ram andtoggle press permitting the employment of a smaller ram cylinder for thesame power. A further object is to provide an improved combination ofthose features in a press whose members have a combined relativereciprocating and tilting movement.

Of the accompanying drawing, Fig. 1 is a side 15 elevation, partlybroken away and in section, showing a preferred embodiment of myinvention.

Fig. 2 is a front elevation of the lower part of the press in openposition.

Fig. 3 is a horizontal section on the line 3-3 of Fig. 2.

In the drawing, is a base to which are secured the lower ends of a pairof upwardly and rearwardly-inclined side frame-plates 11, said plateshaving aflixed to their upper ends an upper press head 13 occupying abackwardly-inclined position and fixedly carrying a steam-jacketed uppermold section 14, in this case adapted for vulcanizing inner tubes forpneumatic tires.

15 is the mating steam-jacketed lower mold section secured to a lowerpress head 16 to whose lower side is attached a pair ofdownwardly-projecting guide rods 17 slidable in guides 18 carried by ayoke-shaped rock-frame 19, the latter being pivoted upon fixed journalstuds 20 on the side frames 11. The head 16 also has a pair oflaterally-projecting journal pins on which are mounted rollers 21 whichoccupy cam slots 22 formed in the side frames 11 and each having arectilinear upper portion 23 parallel with an axis at right angles tothe division plane of the mold and a lower portion 24 inclined at anangle to said upper portion. The said portions serve respectively toguide the lower head and mold section during its reciprocating movementin parallelism with the upper head and mold section during the upperportion of said movement and in a swinging movement out of line with theupper head and mold section during the lower part of said reciprocatingmovement to and from the loading and unloading position represented infull lines in Fig. 1.

For reciprocating the lower press head 16, I provide on opposite sidesof its central axis respective toggle units formed by double pairs oflinks 25, 26, 27, 28, constituting toggles which fold outwardly inopposite directions, the links 25 and 27 being pivoted at their upperends by rods 29 and 30 to ears on the lower side of the head- 16 and thelinks 26 and 28 being pivoted at their lower ends by rods 130 and 31 oncars carried by the rock-frame 19.

32 is the cylinder of a double-acting hydraulic ram having a piston 33and rod 33 constituting the ram plunger, said rod passing through astuffing box in the inner head of the cylinder and connecting at itsforward end with a rod 34 by which the adjoining ends of the togglelinks 25 and 26 are pivoted together. The sides of the cylinder betweenthe ends of the latter, carry a pair of trunnions 35 by which theadjoining ends of the toggle links 27 and 28 are pivoted together. Bythese connections with the toggle links the ram is carried in a floatingmanner by the respective toggle units and its longitudinal axis remainsparallel with the plane of the lower head 16 and mold section 15 duringthe movements of these parts. The location of the pivots 35 between theends of the cylinder 32 balances the ram and reduces the space occupied,longitudinally of the ram, substantially to the smallest dimensions fora given length of stroke. Suitable pipe connections 36, 37 are providedfor carrying fluid pressure to and from the respective ends of the ramcylinder.

In the operation of this press, the lower parts being in the loading andunloading position represented in full lines in the drawing, the pressis closed by admitting fluid pressure to the inner end of the ramcylinder 32 and exhausting the outer end of said cylinder. The rampiston is thereby moved toward the outer end of the cylinder, causingthe inner end of said cylinder to advance and the rod 33 to retract,thereby moving toward each other the knuckle joints formed at the rod 34and the trunnions 35. This moves the toggles toward their straightenedpositions, raising the lower press head 16, causing the rollers 21 tomove up the inclined portions 24 of the cam slots 22, thus tilting thelower head and connected parts toward and into a position of parallelismwith the top head and bringing the ram cylinder 32 into the inclinedposition represented in broken lines, the rollers 21 then entering therectilinear portions 23 of the cam slots during the concluding portionof the upward movement until the lower mold section 15 meets the uppersection 14. This is the position of greater mechanical advantage of thetoggles as compared with the retracted position, but they do not quitereach a straightened condition when the mold is fully closed so that theram pressure will follow up on the lower mold section through thetoggles and keep the mold tightly closed during the vulcanizingoperation. To open the press, fluid pressure is admitted to the outerend of the ram cylinder 32 and discharged from its inner end, therebyreversing the foregoing operations.

By imposing the power of the ram through the described toggle mechanismupon the lower press head, a powerful pressing action is obtainable witha ram of comparatively small diameter and by carrying the ram fioatinglyon the toggle units, a very compact press of simple construction isobtained.

The movable lower parts of this press may be substituted in place ofthose disclosed in my aforesaid prior application, Ser. No. 497,637.

The particular arrangement herein disclosed is susceptible of ratherwide variation without .departing from the scope of the invention asdefined in the claims.

I claim:

1. A molding press comprising press heads mounted for relativereciprocating and tilting movements, toggle mechanism for imparting saidmovements, and a floating power ram carried by said toggle mechanism foractuating the latter.

2. A molding press comprising a pair of press heads of which one ismovable and guided for reciprocating and tilting movements relative tothe other, two oppositely-bending toggle units connected with themovable head for imparting said movements, and a floating ram comprisinga power member mounted on one of the toggle units and having a rodconnected with the other unit" for actuating said toggle units.

3. A molding press comprising press heads mounted for relativereciprocating and tilting movements, a pair of oppositely bending toggleunits for imparting said movements by reciprocation of one of the heads,and a floating power ram carried by said toggle units for actuating thelatter.

4. A molding press comprising a rocker, a movable press head slidable onsaid rocker and adapted to swing therewith, toggle mechanism interposedbetween said head and rocker, a floating power ram carried by saidtoggle mechanism for actuating the latter, and means actuated bymovement of said head for swinging the rocker.

5. A molding press comprising press heads mounted for relativereciprocating and tilting movements, cam means coacting with areciproeating one of said heads for relatively guiding them in suchmovements, toggle mechanism connected with the reciprocating head foractuating the latter, and a floating power ram carried by and adapted tooperate said toggle mechanism. 6. A molding press comprising areciprocating and tilting press head, cam means coacting with said headfor causing the tilting movement by reciprocation of said head, a rockerslidingly carrying said head, a pair of oppositely bending toggle unitsinterposed between said head and rocker, and a floating fluid-pressureram having cylinder and plunger members respectively pivotally carriedby the knuckles of the two toggle units.

JAMES WILLIAM BRUNDAGE.

